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I'm being kind of stupid but why does the prompt injection need to POST to anthropic servers at all, does claude cowork have some protections against POST to arbitrary domain but allow POST to anthropic with arbitrary user or something?

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In the article it says that Cowork is running in a VM that has limited network availability, but the Anthropic endpoint is required. What they don't do is check that the API call you make is using the same API key as the one you created the Cowork session with.

So the prompt injection adds a "skill" that uses curl to send the file to the attacker via their API key and the file upload function.

Yeah they mention it in the article, most network connections are restricted. But not connections to anthropic. To spell out the obvious—because Claude needs to talk to its own servers. But here they show you can get it to talk to its own servers, but put some documents in another user's account, using the different API key. All in a way that you, as an end user, wouldn't really see while it's happening.

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